Markets appeared unmoved by the detention in Gibraltar by British Royal Marines of a supertanker presumably carrying Iranian crude oil sure for Syria, as tensions between Iran and the USA have flared over mysterious assaults on tankers within the Gulf of Oman in current months.

“Positive factors had been capped by the Power Data Administration (EIA) reporting a weekly decline of 1.1 million barrels in crude shares, versus the three million barrels forecast by analysts and 5 million barrels reported by the API a…